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On 12 September 1940, the entrance to Lascaux Cave was discovered by 18-year-old Marcel Ravidat. Ravidat returned to the scene with three friends, Jacques Marsal, Georges Agnel, and Simon Coencas, and entered the cave via a long shaft. The teenagers discovered that the cave walls were covered with depictions of animals.[6][7] The cave complex was opened to the public in 1948.[8] By 1955, the carbon dioxide, heat, humidity, and other contaminants produced by 1,200 visitors per day had visibly damaged the paintings and introduced lichen on the walls. The cave was closed to the public in 1963 to preserve the art. After the cave was closed, the paintings were restored to their original state and were monitored daily. Rooms in the cave include the Hall of the Bulls, the Passageway, the Shaft, the Nave, the Apse, and the Chamber of Felines.

Reproductions of some Lascaux artworks in Lascaux II

Lascaux II, a replica of the Great Hall of the Bulls and the Painted Gallery located 200 meters away from the original, was opened in 1983 so that visitors may view the painted scenes without harming the originals.[7] Reproductions of other Lascaux artwork can be seen at the Centre of Prehistoric Art at Le Thot, France.

Since 1998 the cave has been beset with a fungus, variously blamed on a new air conditioning system that was installed in the caves, the use of high-powered lights, and the presence of too many visitors.[9] As of 2008, the cave contained black mold which scientists were and still are trying to keep away from the paintings. In January 2008, authorities closed the cave for three months even to scientists and preservationists. A single individual was allowed to enter the cave for 20 minutes once a week to monitor climatic conditions. Now only a few scientific experts are allowed to work inside the cave and just for a few days a month but the efforts to remove the mold have taken a toll, leaving dark patches and damaging the pigments on the walls.[10]

In its sedimentary composition, the Vézère drainage basin covers one fourth of the département of the Dordogne, the northernmost region of the Black Périgord. Before joining the Dordogne River near Limeuil, the Vézère flows in a south-westerly direction. At its centre point, the river's course is marked by a series of meanders flanked by high limestone cliffs that determine the landscape. Upstream from this steep-sloped relief, near Montignac and in the vicinity of Lascaux, the contours of the land soften considerably; the valley floor widens, and the banks of the river lose their steepness.

The Lascaux valley is located some distance from the major concentrations of decorated caves and inhabited sites, most of which were discovered further downstream. In the environs of the village of Eyzies-de-Tayac Sireuil, there are no less than 37 decorated caves and shelters, as well as an even greater number of habitation sites from the Upper Paleolithic, located in the open, beneath a sheltering overhang, or at the entrance to one of the area's karst cavities. This is the highest concentration in western Europe.

The cave contains nearly 2,000 figures, which can be grouped into three main categories: animals, human figures, and abstract signs. The paintings contain no images of the surrounding landscape or the vegetation of the time.[11] Most of the major images have been painted onto the walls using mineral pigments, although some designs have also been incised into the stone. Many images are too faint to discern, and others have deteriorated entirely.

Over 900 can be identified as animals, and 605 of these have been precisely identified. Out of these images, there are 364 paintings of equines as well as 90 paintings of stags. Also represented are cattle and bison, each representing 4 to 5% of the images. A smattering of other images include seven felines, a bird, a bear, a rhinoceros, and a human. There are no images of reindeer, even though that was the principal source of food for the artists.[12] Geometric images have also been found on the walls.

The most famous section of the cave is The Great Hall of the Bulls where bulls, equines, and stags are depicted. The four black bulls, or aurochs, are the dominant figures among the 36 animals represented here. One of the bulls is 5.2 metres (17 ft) long, the largest animal discovered so far in cave art. Additionally, the bulls appear to be in motion.[12]

A painting referred to as "The Crossed Bison", found in the chamber called the Nave, is often submitted as an example of the skill of the Paleolithic cave painters. The crossed hind legs create the illusion that one bison is closer to us than the other. This visual depth in the scene demonstrates a primitive form of perspective which was particularly advanced for the time.

According to one theory, the eyes of the bull, the bird, and the bird-man may represent the three stars Vega, Altair, and Deneb commonly known as the Summer Triangle.

In recent years, new research has suggested that the Lascaux paintings may incorporate prehistoric star charts. Michael Rappenglueck of the University of Munich argues that some of the non-figurative dot clusters and dots within some of the figurative images correlate with the constellations of Taurus, the Pleiades and the grouping known as the "Summer Triangle".[13] Based on her own study of the astronomical significance of Bronze Age petroglyphs in the Vallée des Merveilles[14] and her extensive survey of other prehistoric cave painting sites in the region—most of which appear to have been selected because the interiors are illuminated by the setting sun on the day of the winter solstice—French researcher Chantal Jègues-Wolkiewiez has further proposed that the gallery of figurative images in the Great Hall represents an extensive star map and that key points on major figures in the group correspond to stars in the main constellations as they appeared in the Paleolithic.[15][16]

An alternative hypothesis proposed by David Lewis-Williams and Jean Clottes following work with similar art of the San people of Southern Africa is that this type of art is spiritual in nature relating to visions experienced during ritualistic trance-dancing. These trance visions are a function of the human brain and so are independent of geographical location. Nigel Spivey, a professor of classic art and archeology at the University of Cambridge, has further postulated in his series, How Art Made the World, that dot and lattice patterns overlapping the representational images of animals are very similar to hallucinations provoked by sensory-deprivation. He further postulates that the connections between culturally important animals and these hallucinations led to the invention of image-making, or the art of drawing. Further extrapolations include the later transference of image-making behavior from the cave to megalithic sites, and the subsequent invention of agriculture to feed the site builders.

Some anthropologists and art historians also theorize that the paintings could be an account of past hunting success, or could represent a mystical ritual in order to improve future hunting endeavors. This latter theory is supported by the overlapping images of one group of animals in the same cave-location as another group of animals, suggesting that one area of the cave was more successful for predicting a plentiful hunting excursion.

Applying the iconographic method of analysis to the Lascaux paintings (studying position, direction and size of the figures; organization of the composition; painting technique; distribution of the color planes; research of the image center), Thérèse Guiot-Houdart attempted to comprehend the symbolic function of the animals, to identify the theme of each image and finally to reconstitute the canvas of the myth illustrated on the rock walls.[17][further explanation needed]

Julien d'Huy and Jean-Loïc Le Quellec showed that certain angular or barbed signs of Lascaux may be analysed as "weapon" or "wounds". These signs affect dangerous animals—big cats, aurochs and bison—more than others and may be explained by a fear of the animation of the image.[18] Another finding supports the hypothesis of half-alive images. At Lascaux, bison, aurochs and ibex are not represented side by side. Conversely, one can note a bison-horses-lions system and an aurochs-horses-deer-bears system, these animals being frequently associated.[19] Such a distribution may show the relationship between the species pictured and their environmental conditions. Aurochs and bison fight one against the other, and horses and deer are very social with other animals. Bison and lions live in open plains areas; aurochs, deer and bears are associated with forests and marshes; ibex habitat is rocky areas, and horses are highly adaptive for all these areas. The Lascaux paintings' disposition may be explained by a belief in the real life of the pictured species, wherein the artists tried to respect their real environmental conditions.[20]

Less known is the image area called the Abside (Apse), a roundish, semi-spherical chamber similar to an apse in a Romanesque basilica. It is approximately 4.5 meters in diameter (about 5 yards) and covered on every wall surface (including the ceiling) with thousands of entangled, overlapping, engraved drawings.[21] The ceiling of the Apse, which ranges from 1.6 to 2.7 meters high (about 5.2 to 8.9 feet) as measured from the original floor height, is so completely decorated with such engravings that it indicates that the prehistoric people who executed them first constructed a scaffold to do so.[11][22]

The opening of the Lascaux cave after World War II changed the cave environment. The exhalations of 1,200 visitors per day, presence of light, and changes in air circulation have created a number of problems. In the late 1950s the appearance of lichens and crystals on the walls led to closure of the caves in 1963. This led to restriction of access to the real caves to a few visitors every week, and the creation of a replica cave for visitors to Lascaux. In 2001, the authorities in charge of Lascaux changed the air conditioning system which resulted in regulation of the temperature and humidity. When the system had been established, an infestation of Fusarium solani, a white mold, began spreading rapidly across the cave ceiling and walls.[23] The mold is considered to have been present in the cave soil and exposed by the work of tradesmen, leading to the spread of the fungus which was treated with quicklime. In 2007, a new fungus, which has created grey and black blemishes, began spreading in the real cave.

Organized through the initiative of the French Ministry of Culture, an international symposium titled "Lascaux and Preservation Issues in Subterranean Environments" was held in Paris on February 26 and 27, 2009, under the chairmanship of Jean Clottes. It brought together nearly three hundred participants from seventeen countries with the goal of confronting research and interventions conducted in Lascaux Cave since 2001 with the experiences gained in other countries in the domain of preservation in subterranean environments.[24] The proceedings of this symposium were published in 2011. Seventy-four specialists in fields as varied as biology, biochemistry, botany, hydrology, climatology, geology, fluid mechanics, archaeology, anthropology, restoration and conservation, from numerous countries (France, United States, Portugal, Spain, Japan, and others) contributed to this publication.[25]

The problem is ongoing, as are efforts to control the microbial and fungal growths in the cave. The fungal infection crises have led to the establishment of an International Scientific Committee for Lascaux and to rethinking how, and how much, human access should be permitted in caves containing prehistoric art.[26]